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Energies 2017, 10(9), 1384; https://doi.org/10.3390/en10091384

A Novel Sensorless Control Strategy for Brushless Direct Current Motor Based on the Estimation of Line Back Electro-Motive Force

1
School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150080, China
2
School of Astronautics, Harbin Institute of Technology, Harbin 150080, China
3
704 Institute, China Shipbuilding Industry Corporation, Xuhui District, Shanghai 200030, China
4
State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150080, China
*
Author to whom correspondence should be addressed.
Received: 4 August 2017 / Revised: 1 September 2017 / Accepted: 8 September 2017 / Published: 12 September 2017
(This article belongs to the Section Electrical Power and Energy System)

Abstract

In this paper, a novel sensorless control strategy based on the estimation of line back electro-motive force (BEMF) is proposed. According to the phase relationship between the ideal commutation points of the brushless direct current motor (BLDCM) and the zero-crossing points (ZCPs) of the line BEMF, the calculation formula of line BEMF is simplified properly and the commutation rule for different positions of the rotor is presented. The estimation error of line BEMF caused by the freewheeling current of silent phase is analyzed, and the solution is given. With the phase shift of the low-pass filter considered, a compensation method using “60°-α” and “120°-α” is studied in this paper to eliminate the error. Finally, the simulation and experimental results show that the rotor-position-detection error is reduced effectively and the motor driven by the accurate commutation signal can work well at low and high speed. View Full-Text
Keywords: line BEMF estimation; sensorless control; phase delay line BEMF estimation; sensorless control; phase delay
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Tong, C.; Wang, M.; Zhao, B.; Yin, Z.; Zheng, P. A Novel Sensorless Control Strategy for Brushless Direct Current Motor Based on the Estimation of Line Back Electro-Motive Force. Energies 2017, 10, 1384.

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